EG4 Community Forum - Recent Topics

Issues with Morning start on an AC coupled system

Katilin — Wed, 12 Aug 2026 13:16:08 +0000

I have APsystems microinverters AC-coupled to a GridBOSS Smart Port and Flexboss inverter. If the battery reaches my discharge cutoff overnight, the battery stops discharging and the APsystems no longer have an AC reference. In the morning, even when battery SOC is above AC Couple Start SOC, the Smart Port PV doesn't restart. If I manually initiate battery discharge, the APsystems immediately get their AC reference and reconnect. I need this to recover automatically during a utility outage. How should Dark Start be configured with a GridBOSS Smart Port? Does this require the FlexBOSS Dark Start/Dry Contact 2 function, or is there a Smart Port/SOC setting that handles it?

EG4 Connected Solutions eligibility in Massachusetts

18houston — Tue, 11 Aug 2026 12:49:56 +0000

Does anyone know if an Eversource Greater Boston account can complete ConnectedSolutions enrollment with an EG4 FlexBOSS21? I see that National Grid and EG4 have a ConnectedSolutions aggregator agreement, but I can't find anything definitive for Eversource.

One of the EG4 FAQ pages mentions Eversource ( https://eg4electronics.com/grid-services/massachusetts/connectedsolutions/ ) but I haven't been able to find Eversource or any other websites listing EG4 as compatible with the ConnectedSolutions program in Eversource MA territory.

Scoping and Wiring Question.... Battery to ride through until generator starts

JasonJoel — Mon, 10 Aug 2026 13:34:54 +0000

I have a weird situation.

I am building a new house and I am planning on adding a 24kW generator, but I am also looking at installing a GridBOSS + 2x FlexBOSS21 + batteries. The goal is to have whole home battery backup for a short duration (>1 hour is my design goal, longer is just gravy) and generator for long duration outages. Yes, that is a bit expensive to add both just for battery/power, but I this is my forever home and I'm tired of managing a dozen different standalone UPS on my critical electronics.

I am also thinking of adding solar down the road anyway, so adding the gridboss + flexboss21s at build time makes sense to me.

Questions / Guidance Time!!!

1. The new house is sized similar to my current house and in the same area, so I am expecting electrical loads to be similar. 2x variable speed inverter ACs (so low LRA). Average total usage of 6 kW, short peaks of 20 kW. Based on that I believe I need 2x FlexBOSS21 to ensure I always have enough capacity. The question is that for short battery runtime needs do I NEED 3 batteries, or can I live with only 2? I may add more than 2 after solar, but there will be no solar initially. Obviously 2 batteries is attractive from a cost standpoint.

2. If I need 3 batteries, how is a 2 inverter + 3 battery system wired between inverter and battery? The wiring docs say every other one (which would be battery 1 and 3 in a 1-2-3 config), but then also say to NOT use the end batteries. So would both inverters just go on the central ("2") battery in that case?

Thanks for entertaining the (likely) dumb questions!

Jason

XP6000 Will Not Charge With Generator

DougMcH — Mon, 10 Aug 2026 01:06:37 +0000

Hello community, I have a pretty comprehensive writeup on my (2) XP6000 + battery + PV + generator system charging issue, although the system will not let me attach it here. Is there a way to attach a pdf?

I can't for the life of me get the inverters to charge the batteries when on generator. Is this a known issue, and are there posts which address it? A key aspect of the purchase was the ability to charge the batteries with the generator, and not being able to do that makes the system, well, not worth having.

I have quite a few suggestions for EG4, as it seems like the equipment has the promise of being great, with the gap being firmware. In some cases it doesn't seem to me that the changes are particularly hard, but would have a good payoff. But in a casual look through the forum it seems like many suggestions are being made. Is EG4 receptive and responsive to suggestions, and is there a structure for doing so?

If suggestions aren't really being acted on I get it, although I still feel like I should get something which charges my batteries. Any advice would be welcome.

12000 XP with real wall mounted batteries (the second is on the other side of the wall).

Frank Walker — Sun, 09 Aug 2026 21:28:00 +0000

System in construction or operation for a year with no big issues. 4500 watts of east facing solar (MPPT1) to get things going in the morning and ability to switch 6000 watts from west facing older grid tie system to MPPT2 when the grid goes south.

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Lifepower4-V2 AUTO ID (ONLY) RS485- Z03T21 Firmware update

EG4 Eric — Thu, 06 Aug 2026 18:20:37 +0000

Lifepower4-V2 AUTO ID (ONLY)

RS485- Z03T21

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New System EG4 12 Kw with battery EG4 314 AH in Venezuela

AJT_CCS — Wed, 05 Aug 2026 21:34:34 +0000

Good afternoon. Just yesterday we Install and testing de eg 4 12 Kw in Venezuela. in 120/208 volts 60 hz

Everything work good, except the on grid. Normally in our country with use the inverter in back up Mode, Keping the battery full charger.

In these case. i can't find how to set up in Mode On Grid. Only i can keep charge the battery from the grid soc 90 to 90 %, but i want to keep full charge and use only isfd the grid faut.

Some sguestions about how to set on grid??

Regards

EV battery connection

ssparsons — Tue, 04 Aug 2026 14:48:39 +0000

I have an EG4 FlexBoss and GridBoss with solar and 2 battery storage. I'd like to hookup an EV 100K battery to my system instead of putting on another 14K battery. Has anyone done this or know if it is possible??

New Flexboss21 off line

Myronbilliot — Sun, 02 Aug 2026 22:07:44 +0000

I purchased a second Flexboss21 to add to my system. I have everything connected except for the parallel cable until I get the firmware updated to match my first Flexboss21. The new Flexboss21 shows off line no matter what I do. The dongle is connected to the network and I can see it thru the app and web page but the inverter shows offline. I have just a battery, grid power and output power wires connected. I connected solar just to see and it does not have any effect, still offline.

Number of batteries inconsistent.

mbormans — Sun, 02 Aug 2026 01:54:46 +0000

I have upgraded my 18kPv to FAAB-2727 . Never noticed this before. On my windows laptop I have suddenly 840 Ah capacity. I have 2 280Ah batteries, so 560 Ah. 840 Ah is 3 of these, but I do not have 3. Checked my android app, it shows 560 Ah. That is correct. But when you select Battery Params, it shows 840 Ah. Minutes later, they all show 560 Ah. And some time later 840 again.

Anybody seen this?

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